Much cheaper in the long run! I have several aquariums and the strips are expensive! One of them went gray in a few days and I wasn't sure what that meant so I tested it with a strip and it turned out there was ammonia in that tank! They don't have a gray area to let you know to test the waters.
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π Seachem Stability 250ml: The Ultimate Fish Tank Stabilizer for Freshwater and Marine Aquariums
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